some answers .... and some more questions

do you have head lights, tail lights and brake lights ?? did you check all the fuses ?? is the stereo a new one ? as in not original ? and is it wired back to the ignition or will it run without the keys ?

the ol' dattos have a 2 speed fan for the heater ... you turn it on by pulling out the heater control slider thingy.

the A14 head will bolt onto a later model A12, does your motor have the distibuter up the front and the altenator down low on the passenger side ? if it does then you have an early A12 and the head will not be a straight bolt on but it doesn't take much to get it right to go onn to the early motors.

the A14 has bigger valves than the A12 already, did you want to go bigger than the A14 valves ?? on the A12 you shouldn't have any issues with the A14 valves even with motorbike carbs.